A method, device, equipment and medium for determining the elevation of riverbed deformation

Abstract

The embodiment of the present application discloses a method, device, equipment and medium for determining riverbed deformation elevation, which relates to the technical field of water conservancy engineering. It includes: determining the friction barrier parameters of the riverbed sediment in the river to be measured relative to the water flow interface at different scouring times according to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment radius and riverbed sediment density of the river to be measured; determining the friction barrier critical value according to the sediment repose angle of the river to be measured and the water flow direction at the riverbed; determining the scouring mode corresponding to each friction barrier parameter according to the relative size of each friction barrier parameter and the friction barrier critical value; using the corresponding proportion determination method of the corresponding scouring mode to determine the proportion of moving sediment particles corresponding to each friction barrier parameter at different scouring times; determining the riverbed deformation elevation of the river to be measured at the corresponding scouring time according to the proportion of moving sediment particles at different scouring times. This technical solution improves the accuracy of the riverbed deformation elevation.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of water conservancy engineering technology, and in particular to a method, device, equipment and medium for determining riverbed deformation elevation. Background Art

[0002] The riverbed is the geometric boundary that carries the river water. It is usually composed of bedrock, pebbles and sediments, and is in a state of constant scouring or silting under the action of water flow. The scouring and silting of the riverbed is manifested as changes in the riverbed elevation. This change can have a serious impact on the safety and reliable operation of water-related structures such as dams, bridges, water intakes, waterways and ports.

[0003] In the prior art, a fixed single empirical formula is usually used to determine the riverbed deformation elevation, which has the defect that the determined riverbed deformation elevation has a poor accuracy. Summary of the invention

[0004] The present application provides a method for determining riverbed deformation elevation to improve the accuracy of riverbed deformation elevation.

[0005] In a first aspect, the present application provides a method for determining riverbed deformation elevation, comprising:

[0006] According to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment radius and riverbed sediment density of the river to be tested, the friction barrier parameters of the riverbed sediment in the river to be tested relative to the water flow interface at different scouring times are determined;

[0007] Determine the friction barrier critical value based on the sediment repose angle of the river to be tested and the direction of water flow at the riverbed;

[0008] According to the relative size of each friction barrier parameter and the friction barrier critical value, the flushing mode corresponding to each friction barrier parameter is determined respectively;

[0009] The proportion of moving sediment particles corresponding to each friction barrier parameter at different scouring moments is determined by using the corresponding proportion determination method of the corresponding scouring mode;

[0010] According to the proportion of moving sediment particles at different scouring moments, the riverbed deformation elevation of the river to be tested at the corresponding scouring moment is determined.

[0011] In a second aspect, the present application also provides a device for determining riverbed deformation elevation, comprising:

[0012] A parameter determination module is used to determine the friction barrier parameters of the riverbed sediment in the river to be tested relative to the water flow interface at different scouring times according to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment radius and riverbed sediment density of the river to be tested;

[0013] A critical value determination module, configured to determine a friction resistance critical value according to the sediment repose angle of the river to be measured and the water flow direction at the riverbed;

[0014] An erosion mode determination module, configured to determine the erosion mode corresponding to each friction resistance parameter according to the relative magnitudes of each friction resistance parameter and the friction resistance critical value;

[0015] A proportion determination module, configured to determine the proportion of moving sediment particles corresponding to each friction resistance parameter at different erosion times by using the proportion determination method corresponding to the corresponding erosion mode;

[0016] An elevation determination module, configured to determine the riverbed deformation elevation of the river to be measured at the corresponding erosion time according to the proportion of moving sediment particles at different erosion times.

[0017] In a third aspect, an embodiment of the present application further provides an electronic device, including:

[0018] At least one processor; and

[0019] A memory communicatively connected to the at least one processor; wherein

[0020] The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute a method for determining the riverbed deformation elevation provided in any embodiment of the present application.

[0021] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, and the computer-readable storage medium stores computer instructions for causing a processor to implement a method for determining the riverbed deformation elevation provided in any embodiment of the present application when executed.

[0022] This application determines the friction resistance parameters of the riverbed sediment in the river to be measured at the water flow interface at different scouring times according to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment radius, and riverbed sediment density of the river to be measured; determines the friction resistance critical value according to the angle of repose of the sediment in the river to be measured and the water flow direction at the riverbed; determines the scouring mode corresponding to each friction resistance parameter according to the relative magnitudes of the friction resistance parameters and the friction resistance critical value; determines the proportion of moving sediment particles corresponding to each friction resistance parameter at different scouring times by using the corresponding proportion determination method for the scouring mode; and determines the riverbed deformation elevation at the corresponding scouring time according to the proportion of moving sediment particles at different scouring times. The technical solution of this application determines the scouring mode corresponding to each friction resistance parameter according to the relative magnitudes of the friction resistance parameter and the friction resistance critical value, and differentiates the proportion determination method according to the scouring mode, so that different scouring modes adopt different proportion determination methods to determine the proportion of moving sediment particles at different scouring times in the corresponding mode, improving the accuracy of the proportion of moving sediment particles in different scouring modes, and further improving the accuracy of the riverbed deformation elevation determined based on the proportion of moving sediment particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of this application, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0024] Figure 1A is a flowchart of a method for determining the riverbed deformation elevation provided in Embodiment 1 of this application;

[0025] Figure 1B is a schematic diagram of the forces acting on the sediment particles in the riverbed provided in Embodiment 1 of this application;

[0026] Figure 2A is a flowchart of a method for determining the riverbed deformation elevation provided in Embodiment 2 of this application;

[0027] Figure 2B is a schematic diagram of the variation law of the proportion of moving sediment particles with the friction resistance parameter provided in Embodiment 2 of this application;

[0028] Figure 2C is a comparison diagram of the initial scouring state of the riverbed sediment at the same time in the clear water scouring mode between this application and the prior art provided in Embodiment 2 of this application;

[0029] Figure 3A is a flowchart of a method for determining the riverbed deformation elevation provided in Embodiment 3 of this application;

[0030] Figure 3B It is a schematic diagram of the final scour pit state accumulated at different scour moments of riverbed sediment provided in Embodiment 3 of the present application;

[0031] Figure 4 It is a structural diagram of a device for determining the elevation of riverbed deformation provided in Embodiment 4 of the present application;

[0032] Figure 5 It is a schematic structural diagram of an electronic device provided in Embodiment 5 of the present application. Detailed implementation manners

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0034] It should be noted that the terms "first" and "second" in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0035] Embodiment 1

[0036] Figure 1A It is a flowchart of a method for determining the elevation of riverbed deformation provided in Embodiment 1 of the present application. This embodiment is applicable to the situation of determining the elevation of riverbed deformation of a river. This method can be executed by a device for determining the elevation of riverbed deformation, and the device for determining the elevation of riverbed deformation can be implemented in the form of hardware and / or software and is specifically configured in an electronic device, such as a server.

[0037] As Figure 1A shown, the method includes:

[0038] S101. Determine the friction resistance parameters at different scouring moments of the riverbed sediment in the river to be measured relative to the water flow interface according to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment radius, and riverbed sediment density of the river to be measured.

[0039] In this embodiment, the cylinder Reynolds number can be the Reynolds number of the cylinder standing in the river to be measured; the cylinder radius can be the radius of the cylinder standing in the river to be measured; the riverbed sediment radius can be the particle size of the riverbed sediment particles in the river to be measured; the riverbed sediment density can be the density of the riverbed sediment particles in the river to be measured in the river to be measured; the friction resistance parameter can be used to characterize the mobility of the riverbed sediment; the larger the friction resistance parameter, the stronger the mobility of the riverbed sediment. In an alternative embodiment, the cylinder can be a pier standing in the river to be measured.

[0040] S102. Determine the friction resistance critical value according to the angle of repose of the sediment in the river to be measured and the water flow direction at the riverbed.

[0041] In this embodiment, the angle of repose of the sediment can be the angle between the riverbed sediment plane and the horizontal plane; the friction resistance critical value can be the friction resistance parameter when the riverbed sediment in the river to be measured just starts to move.

[0042] Specifically, take the angle between the riverbed sediment plane and the water flow direction at the riverbed as the first angle; determine the reference value product and the reference ratio according to the first angle, the angle of repose of the sediment, and the static friction coefficient respectively; determine the difference between the reference product and the reference ratio; take the product of the difference and the reference friction resistance critical value when the angle of repose of the sediment is 0 as the friction resistance critical value; among them, the friction resistance critical value and the static friction coefficient when the angle of repose of the sediment is 0 can be set independently by those skilled in the art according to actual needs or actual experience, and the present application does not limit this. In a specific embodiment, the friction resistance critical value when the angle of repose of the sediment is 0 is 0.05. Exemplarily, the friction resistance critical value can be determined by the following formula:

[0043]

[0044] where θ c represents the friction resistance critical value; θ c0 represents the reference friction resistance critical value when the angle of repose of the sediment is 0; represents the reference product; represents the reference ratio; β represents the angle of repose of the sediment; α represents the first angle; μ s represents the static friction coefficient.

[0045] Optionally, Figure 1B is a schematic diagram of the forces on the sediment particles in the riverbed. As Figure 1BAs shown, the riverbed surface is the plane of the riverbed sediment of the river to be measured; the angle between the riverbed surface and the horizontal plane is the angle of repose of the sediment, and the angle size is β; F D is the resultant force of the drag force and the lift force acting on the sediment particles; wsinβ is the component of the gravity of the sediment particles tangent to the riverbed; u τ is the friction velocity of the sediment particles; u b is the average velocity of the sediment particles; the angle between the gravity component wsinβ tangent to the riverbed and the friction velocity u τ is the first angle, and the angle size is α; among them, the directions of the friction velocity and the average velocity of the sediment particles are the same.

[0046] S103. According to the relative magnitudes of each friction resistance parameter and the friction resistance critical value, determine the erosion pattern corresponding to each friction resistance parameter respectively.

[0047] In this embodiment, the erosion pattern can be the pattern of the water flow of the river to be measured scouring the riverbed sediment particles. Exemplarily, at least one erosion pattern can be set for different friction resistance parameters, and the determination methods of the corresponding proportions of different erosion patterns are different.

[0048] S104. Adopt the corresponding proportion determination method of the erosion pattern to determine the proportion of the moving sediment particles corresponding to each friction resistance parameter at different erosion times.

[0049] In this embodiment, the proportion determination method can be the determination method of the proportion of the moving sediment particles; the proportion of the moving sediment particles can be the ratio between the moving sediment particles in the riverbed sediment particles and all the riverbed sediment particles. Among them, the proportion determination methods corresponding to different erosion patterns are different to improve the accuracy of the determination results of the proportion of the moving sediment particles under different erosion patterns. Specifically, for any erosion pattern, according to the proportion determination method of this erosion pattern, determine the proportion of the moving sediment particles corresponding to each friction resistance parameter at different erosion times under this erosion pattern.

[0050] It should be noted that by using different proportion determination methods to determine the proportion of the moving sediment particles at different erosion times in the corresponding erosion patterns respectively, instead of mechanically using a single proportion determination method throughout the erosion process, the accuracy of the determination results of the proportion of the moving sediment particles under different erosion patterns is improved.

[0051] S105. According to the proportion of the moving sediment particles at different erosion times, determine the deformation elevation of the riverbed of the river to be measured at the corresponding erosion time.

[0052] In this embodiment, the riverbed deformation elevation may be the elevation of the riverbed sediment of the river to be measured. After the riverbed sediment is eroded and deformed by the water flow, it is the elevation of the riverbed based on the horizontal plane. Specifically, according to the proportion of moving sediment particles at different erosion times and the hydrodynamic sediment transport equilibrium equation, the riverbed deformation elevation of the river to be measured at the corresponding erosion time is determined.

[0053] In the embodiment of the present application, the friction resistance parameters of the riverbed sediment in the river to be measured relative to the water flow interface at different erosion times are determined according to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment particle size, and riverbed sediment density of the river to be measured; the friction resistance critical value is determined according to the angle of repose of the sediment in the river to be measured and the water flow direction at the riverbed; according to the relative magnitudes of the friction resistance parameters and the friction resistance critical value, the erosion modes corresponding to the friction resistance parameters are respectively determined; the proportion determination method corresponding to the erosion mode is used to determine the proportion of moving sediment particles corresponding to the friction resistance parameters at different erosion times; according to the proportion of moving sediment particles at different erosion times, the riverbed deformation elevation of the river to be measured at the corresponding erosion time is determined. The technical solution of the present application determines the erosion mode corresponding to each friction resistance parameter according to the relative magnitudes of the friction resistance parameters and the friction resistance critical value, and differentiates the proportion determination method according to the erosion mode, so that different proportion determination methods are used for different erosion modes to determine the proportion of moving sediment particles at different erosion times in the corresponding mode, improving the accuracy of the proportion of moving sediment particles in different erosion modes, and further improving the accuracy of the riverbed deformation elevation determined based on the proportion of moving sediment particles.

[0054] Embodiment 2

[0055] Figure 2A It is a flowchart of a method for determining the riverbed deformation elevation provided in Embodiment 2 of the present application. This embodiment is additionally optimized on the basis of the above embodiments.

[0056] Further, "the erosion mode is a clear water erosion mode or a movable bed erosion mode; among them, the proportion determination methods corresponding to different erosion modes are different" is added to enrich the diversity of the erosion mode, and further improve the flexibility of determining the erosion mode.

[0057] It should be noted that for the parts not described in detail in the embodiments of the present application, reference can be made to the descriptions of the foregoing embodiments.

[0058] As Figure 2A shown in the method, the method includes:

[0059] S201. Determine the friction resistance parameters of the riverbed sediment in the river to be measured relative to the water flow interface at different erosion times according to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment radius, and riverbed sediment density of the river to be measured.

[0060] S202. Determine the friction resistance critical value according to the sediment repose angle of the river to be measured and the water flow direction at the riverbed.

[0061] S203. Determine the erosion mode corresponding to each friction resistance parameter according to the relative magnitude of each friction resistance parameter and the friction resistance critical value; the erosion mode is the clear-water erosion mode or the movable-bed erosion mode; among them, the determination method of the corresponding proportion of different erosion modes is different.

[0062] In this embodiment, the clear-water erosion mode may be an erosion mode in which the water flow does not cause the sediment particles on the riverbed to move; the movable-bed erosion mode may be an erosion mode in which the water flow causes the sediment particles on the riverbed to move.

[0063] In an alternative embodiment, if the friction resistance parameter is greater than the friction resistance critical value, the erosion mode is the movable-bed erosion mode; if the friction resistance parameter is not greater than the friction resistance critical value, the erosion mode is the clear-water erosion mode.

[0064] It can be understood that by adopting the above technical solution, according to the magnitude relationship between the friction resistance parameter and the friction resistance critical value, the erosion mode is determined to be the movable-bed erosion mode or the clear-water erosion mode, which improves the flexibility of the erosion mode, improves the accuracy of determining the erosion mode, and further improves the accuracy of determining the proportion of moving sediment particles and the accuracy of determining the riverbed deformation elevation.

[0065] S204. Adopt the corresponding proportion determination method of the erosion mode to determine the proportion of moving sediment particles corresponding to each friction resistance parameter at different erosion times.

[0066] In an alternative embodiment, if the erosion mode corresponding to the corresponding erosion time is the clear-water erosion mode, adopt the corresponding proportion determination method of the erosion mode to determine the proportion of moving sediment particles corresponding to each friction resistance parameter at different erosion times, including: setting the proportion of moving sediment particles at the corresponding erosion time to a preset proportion threshold. Among them, the preset proportion threshold can be set independently by those skilled in the art according to actual needs or practical experience, and the present application does not limit this.

[0067] It can be understood that by adopting the above technical solution, setting the proportion of moving sediment particles in the clear-water erosion mode corresponding to the corresponding erosion time to a preset proportion threshold can make the proportion of moving sediment particles in the clear-water erosion mode relatively fixed, in order to conform to the characteristic that the water flow basically does not change the movement state of the sediment particles on the riverbed in the clear-water erosion mode, and improves the accuracy of the riverbed deformation elevation determined according to the proportion of moving sediment particles.

[0068] Optionally, the preset proportion threshold is 0. It can be understood that the preset proportion threshold of the proportion of moving sediment particles in the clear water scouring mode is determined to be 0, that is, in the clear water scouring mode, there are no moving sediment particles in the riverbed sediment particles.

[0069] In another optional embodiment, if the corresponding scouring moment corresponds to the movable bed scouring mode with blocking scouring, the corresponding proportion determination method for the scouring mode is adopted to determine the proportion of moving sediment particles corresponding to each friction blocking parameter at different scouring moments, including: determining the proportion of moving sediment particles at the corresponding scouring moment according to the friction blocking parameter, the friction blocking critical value, and the dynamic friction coefficient of the river to be measured under the preset sediment repose angle.

[0070] Among them, the preset sediment repose angle can be independently set by those skilled in the art according to actual needs or practical experience, and the present application does not limit this. In a specific embodiment, the size of the preset sediment repose angle is 27°, and the dynamic friction coefficient of the river to be measured under this preset sediment repose angle is 0.62.

[0071] Specifically, determine the difference between the friction blocking parameter and the friction blocking critical value; determine the proportion of moving sediment particles in the movable bed scouring mode according to the ratio of the dynamic friction coefficient to this difference:

[0072] Exemplarily, the proportion of moving sediment particles in the movable bed scouring mode can be determined by the following formula:

[0073]

[0074] Among them, P EF represents the proportion of moving sediment particles; μ d represents the dynamic friction coefficient; θ represents the friction blocking parameter; θ c represents the friction blocking critical value.

[0075] It can be understood that by adopting the above technical solution, the proportion of moving sediment particles at the corresponding scouring moment is determined according to the friction blocking parameter, the friction blocking critical value, and the dynamic friction coefficient of the river to be measured under the preset sediment repose angle, which improves the accuracy of the determined proportion of moving sediment particles in the movable bed scouring mode, and further improves the accuracy of the riverbed deformation elevation determined according to the proportion of moving sediment particles.

[0076] Optionally, the proportion of moving sediment particles of each friction blocking parameter in the corresponding scouring mode being the clear water scouring mode or the movable bed scouring mode at the corresponding scouring moment can be determined by the following formula:

[0077]

[0078] Among them, P EFrepresents the proportion of moving sediment particles; μ d represents the dynamic friction coefficient; θ represents the friction resistance parameter; θ c represents the critical value of friction resistance.

[0079] Optionally, Figure 2B is a schematic diagram of the regular change of the proportion of moving sediment particles with the friction resistance parameter. As Figure 2B shown. Among them, the original model is the model of the technical solution for determining the proportion of moving sediment particles in the prior art, and the corresponding change regular curve is the dotted curve; the modified model is the model of the technical solution for determining the proportion of moving sediment particles in this application, and the corresponding change regular curve is the solid curve; the left regular change diagram (a) is for the dynamic friction coefficient μ d of 0.15, the regular change diagram of the proportion P EF of moving sediment particles; the right regular change diagram (b) is for the dynamic friction coefficient μ d of 1, the regular change diagram of the proportion P EF of moving sediment particles. As shown in the figure, the curve corresponding to the original model has a singularity when the friction resistance parameter θ is equal to the critical value θ c of friction resistance, and the curve is symmetric about the straight line when the friction resistance parameter θ is equal to the critical value θ c of friction resistance. Since when θ ≤ θ c , the proportion of moving sediment particles will also change violently with the change of θ, so the regularity accuracy of the proportion P EF of moving sediment particles represented by this curve with the change of the friction resistance parameter θ is poor; the curve corresponding to the modified model has no singularity when the friction resistance parameter θ is equal to the critical value θ c of friction resistance, and when the friction resistance parameter θ is less than the critical value θ c of friction resistance, the proportion of moving sediment particles is 0, which can be applied to the calculation of the bed load transport rate when the river bed reaches a stable state under the clear water scouring mode.

[0080] S205. Determine the deformation elevation of the river bed to be measured at the corresponding scouring moment according to the proportion of moving sediment particles at different scouring moments.

[0081] Optionally, Figure 2C is a comparison diagram of the initial scouring state of the river bed sediment at the same moment under the clear water scouring mode between this application and the prior art. As Figure 2C shown, among them, (a) is the initial scouring state of the river bed sediment under the clear water scouring mode determined by the prior art; (b) is the initial scouring state of the river bed sediment under the clear water scouring mode determined by the method for determining the proportion of moving sediment particles in the embodiment of this application, and the flatness of the river bed is maintained.

[0082] In an embodiment of the present application, according to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment radius, and riverbed sediment density of the river to be measured, the friction resistance parameters of the riverbed sediment in the river to be measured relative to the water flow interface at different scouring times are determined; according to the angle of repose of the sediment in the river to be measured and the water flow direction at the riverbed, the friction resistance critical value is determined; according to the relative magnitudes of the respective friction resistance parameters and the friction resistance critical value, the scouring mode corresponding to each friction resistance parameter is determined respectively; the scouring mode is a clear water scouring mode or a movable bed scouring mode; wherein, the determination methods of the corresponding proportions of different scouring modes are different; the determination method of the corresponding proportion of the corresponding scouring mode is adopted to determine the proportion of moving sediment particles corresponding to each friction resistance parameter at different scouring times; according to the proportion of moving sediment particles at different scouring times, the elevation of the riverbed deformation of the river to be measured at the corresponding scouring time is determined. In the technical solution of the embodiment of the present application, the scouring mode is a clear water scouring mode or a movable bed scouring mode, which improves the flexibility of the scouring mode and the accuracy of the scouring mode. The determination methods of the corresponding proportions of different scouring modes are different, which improves the accuracy of the proportion of moving sediment particles and the accuracy of the elevation of the riverbed deformation.

[0083] Embodiment III

[0084] Figure 3A It is a flowchart of a method for determining the elevation of riverbed deformation provided by Embodiment III of the present application. On the basis of the technical solution of the above embodiment, the determination operation of the friction resistance parameter is optimized and improved.

[0085] Further, "According to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment particle size, and riverbed sediment density of the river to be measured, determine the friction velocity of the riverbed sediment in the river to be measured relative to the water flow interface at different scouring times" is refined to "According to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment particle size, and riverbed sediment density of the river to be measured, determine the friction velocity of the riverbed sediment in the river to be measured relative to the water flow interface at different scouring times; according to the friction velocity at different scouring times, determine the friction resistance parameter at the corresponding scouring time", so as to improve the determination operation of the friction resistance parameter.

[0086] It should be noted that for the parts not detailed in the embodiment of the present application, reference may be made to the descriptions of the foregoing embodiments.

[0087] As Figure 3A shown in the method, the method includes:

[0088] S301. According to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment radius, and riverbed sediment density of the river to be measured, determine the friction velocity of the riverbed sediment in the river to be measured relative to the water flow interface at different scouring times.

[0089] In this embodiment, the friction velocity may be the friction velocity of the sediment particles on the riverbed.

[0090] Specifically, according to the river depth, the cylinder Reynolds number, the cylinder radius, the riverbed sediment radius, and the riverbed sediment density, the velocity field of the riverbed sediment particles is determined through the Navier-Stokes equation; the water flow is divided into grids in the vertical and horizontal directions; when the water flow velocity is 0, the distance from the center of the bottommost grid to the riverbed is taken as the ideal grid distance; according to the velocity field, the river depth, the ideal grid distance, and the logarithmic law of velocity distribution, the friction velocity at different scouring times at the interface between the riverbed sediment and the water flow is determined. In this embodiment, the logarithmic law of velocity distribution can be understood as that the velocity ratio between the velocity field and the friction velocity is equal to 2.5 times the distance ratio between the river depth and the ideal grid distance. Among them, the specific grid division method of the present application is not limited in any way and can be set independently by those skilled in the art according to actual needs or practical experience.

[0091] Exemplarily, the friction velocity can be determined by the following formula:

[0092]

[0093] where u τ represents the friction velocity; z represents the river depth; represents the velocity field of the sediment particles on the riverbed; z0 represents the ideal grid distance.

[0094] In a specific embodiment, 96 layers of grids are taken in the vertical direction, and 206 grids are taken around the cylinder in the horizontal direction to divide the water flow of the river to be measured, so as to ensure that the first layer of grid falls in the viscous layer of the logarithmic law of velocity distribution.

[0095] S302. Determine the friction blocking parameter at the corresponding scouring moment according to the friction velocity at different scouring moments.

[0096] In this embodiment, the ratio between the sediment density of the riverbed of the river to be measured and the water density of the river to be measured is used as the density dimension constant; according to the density dimension constant, the gravitational acceleration and the median particle size, a first reference value is determined; the ratio between the friction velocity at different moments and the first reference value is determined as the friction blocking parameter at the corresponding scouring moment; wherein, the median particle size can be the average particle size between the sediment particles of a preset number of particles among all the sediment particles on the riverbed; exemplarily, the friction blocking parameter can be determined by the following formula:

[0097]

[0098] wherein, θ represents the friction blocking parameter; u τ represents the friction velocity; s represents the density dimension constant; g represents the gravitational acceleration; d 50 represents the median particle size; (s - 1)gd 50 represents the first reference value; ρ s represents the sediment density of the riverbed; ρ represents the water density.

[0099] S303. Determine the friction blocking critical value according to the angle of repose of the sediment of the river to be measured and the water flow direction at the riverbed.

[0100] S304. Determine the scouring mode corresponding to each friction blocking parameter according to the relative magnitudes of each friction blocking parameter and the friction blocking critical value.

[0101] S305. Determine the proportion of moving sediment particles corresponding to each friction blocking parameter at different scouring moments by using the corresponding proportion determination method of the scouring mode.

[0102] S306. Determine the elevation of the riverbed deformation of the river to be measured at the corresponding scouring moment according to the proportion of moving sediment particles at different scouring moments.

[0103] Optionally, based on the friction resistance critical value, as well as the friction velocity and friction resistance parameters at different scouring times, determine the average velocity of the moving sediment particles at the corresponding scouring time; based on the average velocity of the moving sediment particles and the proportion of moving sediment particles at different scouring times, determine the bed load transport rate of the river to be measured at the corresponding scouring time; based on the bed load transport rate at different scouring times, determine the riverbed deformation elevation of the river to be measured at the corresponding scouring time.

[0104] Among them, the bed load transport rate can be the movement rate of the riverbed sediment particles under the action of water flow scouring.

[0105] Specifically, based on the friction resistance parameter and the friction resistance critical value, determine the friction resistance reference value; determine the product of the friction resistance reference value, the empirical constant, and the friction velocity as the average velocity of the moving sediment particles; among them, the empirical constant can be set independently by technicians according to actual needs or practical experience. In a specific embodiment, the empirical constant is 10; exemplarily, the average velocity of the moving sediment particles can be determined by the following formula:

[0106]

[0107] Among them, u b represents the average velocity of the moving sediment particles; θ c represents the friction resistance critical value; θ represents the friction resistance parameter; u τ represents the friction velocity; represents the friction resistance reference value; a represents the empirical constant.

[0108] Based on the average velocity of the moving sediment, the proportion of moving sediment particles, and the particle size of the riverbed sediment at different scouring times, determine the bed load transport rate of the river to be measured at the corresponding scouring time; exemplarily, the bed load transport rate can be determined by the following formula:

[0109]

[0110] Among them, q b represents the bed load transport rate; P EF represents the proportion of moving sediment particles; u b represents the average velocity of the moving sediment particles.

[0111] Based on the hydrodynamic sediment transport equilibrium equation, the bed load transport rate, and the porosity of the riverbed sediment, determine the riverbed deformation elevation at the corresponding scouring time; among them, the porosity can be set independently by technicians according to actual needs or practical experience; in a specific embodiment, the porosity is 0.4; exemplarily, the riverbed deformation elevation of the river to be measured at the corresponding scouring time can be determined by the following formula:

[0112]

[0113] Among them, η represents the porosity of the riverbed sediment; Z b represents the elevation of riverbed deformation; t represents the scouring time; q b represents the bed load transport rate.

[0114] Optionally, Figure 3B is a schematic diagram of the final scouring pit state accumulated at different scouring times of the riverbed sediment provided in Embodiment III of the present application. As Figure 3B shown, among them, the final scouring pit state can be the scouring pit state formed after the riverbed elevation changes under the clear water scouring mode and finally remains stable; the final scouring pit state corresponding to (a) is the actual final scouring pit state under the clear water scouring mode determined in the experiment; the final scouring pit state corresponding to (b) is the theoretical final scouring pit state under the clear water scouring mode determined by using the riverbed deformation elevation determination method of the embodiment of the present application. In the theoretical final scouring pit state, the local scouring of the cylinder and the horseshoe vortex from upstream also come from the wake vortex downstream of the pier, which is consistent with the actual final scouring pit state under the clear water scouring mode determined in the experiment.

[0115] In the embodiment of the present application, according to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment radius, and riverbed sediment density of the river to be measured, the friction velocity of the riverbed sediment in the river to be measured relative to the water flow interface at different scouring times is determined; according to the friction velocity at different scouring times, the friction resistance parameter at the corresponding scouring time is determined; according to the friction resistance critical value, as well as the friction velocity and friction resistance parameter at different scouring times, the average velocity of the moving sediment particles at the corresponding scouring time is determined; according to the average velocity of the moving sediment particles and the proportion of the moving sediment particles at different scouring times, the bed load transport rate of the river to be measured at the corresponding scouring time is determined; according to the bed load transport rate at different scouring times, the riverbed deformation elevation of the river to be measured at the corresponding scouring time is determined. The technical solution of the embodiment of the present application determines the friction velocity at different scouring times and determines the friction resistance parameter according to the friction velocity, improving the accuracy of the friction resistance parameter; determines the average velocity of the moving sediment particles and the bed load transport rate, and determines the riverbed deformation elevation at the corresponding scouring time, improving the accuracy of the riverbed deformation elevation.

[0116] Embodiment IV

[0117] Figure 4 is a structural diagram of a device for determining the riverbed deformation elevation provided in Embodiment IV of the present application. This embodiment is applicable to the situation of determining the riverbed deformation elevation. The device for determining the riverbed deformation elevation can be implemented in the form of hardware and / or software and is specifically configured in an electronic device, such as a server.

[0118] As Figure 4 The shown riverbed deformation elevation determination device includes a parameter determination module 401, a critical value determination module 402, an erosion mode determination module 403, a proportion determination module 404, and an elevation determination module 405. Among them,

[0119] The parameter determination module 401 is used to determine the friction resistance parameters of the riverbed sediment in the river to be measured relative to the water flow interface at different erosion times according to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment radius, and riverbed sediment density of the river to be measured;

[0120] The critical value determination module 402 is used to determine the friction resistance critical value according to the sediment repose angle of the river to be measured and the water flow direction at the riverbed;

[0121] The erosion mode determination module 403 is used to determine the erosion mode corresponding to each friction resistance parameter according to the relative magnitudes of each friction resistance parameter and the friction resistance critical value;

[0122] The proportion determination module 404 is used to determine the proportion of moving sediment particles corresponding to each friction resistance parameter at different erosion times by using the proportion determination method corresponding to the corresponding erosion mode;

[0123] The elevation determination module 405 is used to determine the riverbed deformation elevation of the river to be measured at the corresponding erosion time according to the proportion of moving sediment particles at different erosion times.

[0124] In the embodiment of the present application, the parameter determination module determines the friction resistance parameters of the riverbed sediment in the river to be measured relative to the water flow interface at different erosion times according to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment radius, and riverbed sediment density of the river to be measured; the critical value determination module determines the friction resistance critical value according to the sediment repose angle of the river to be measured and the water flow direction at the riverbed; the erosion mode determination module determines the erosion mode corresponding to each friction resistance parameter according to the relative magnitudes of each friction resistance parameter and the friction resistance critical value; the proportion determination module determines the proportion of moving sediment particles corresponding to each friction resistance parameter at different erosion times by using the proportion determination method corresponding to the corresponding erosion mode; the elevation determination module determines the riverbed deformation elevation of the river to be measured at the corresponding erosion time according to the proportion of moving sediment particles at different erosion times. The technical solution of the present application determines the erosion mode corresponding to each friction resistance parameter according to the relative magnitudes of the friction resistance parameter and the friction resistance critical value, and differentiates the proportion determination method according to the erosion mode, so that different erosion modes adopt different proportion determination methods to determine the proportion of moving sediment particles at different erosion times in the corresponding mode, improving the accuracy of the proportion of moving sediment particles in different erosion modes, and further improving the accuracy of the riverbed deformation elevation determined based on the proportion of moving sediment particles.

[0125] Optionally, for the riverbed deformation elevation determination device, wherein the scouring mode is a clear water scouring mode or a movable bed scouring mode; and different scouring modes correspond to different determination methods for the proportion.

[0126] Optionally, the scouring mode determination module 403 includes:

[0127] A movable bed scouring mode determination unit, configured to determine that the scouring mode is a movable bed scouring mode if the friction resistance parameter is greater than the friction resistance critical value;

[0128] A clear water scouring mode determination unit, configured to determine that the scouring mode is a clear water scouring mode if the friction resistance parameter is not greater than the friction resistance critical value.

[0129] Optionally, the proportion determination module 404 is specifically configured to:

[0130] If the scouring mode corresponding to the corresponding scouring moment is a clear water scouring mode, set the proportion of moving sediment particles at the corresponding scouring moment to a preset proportion threshold.

[0131] Optionally, for the riverbed deformation elevation determination device, wherein the preset proportion threshold is 0.

[0132] Optionally, the proportion determination module 404 is specifically configured to:

[0133] If the scouring mode corresponding to the corresponding scouring moment is a movable bed scouring mode, determine the proportion of moving sediment particles at the corresponding scouring moment according to the friction resistance parameter, the friction resistance critical value, and the dynamic friction coefficient of the river to be measured under the preset sediment angle of repose at the corresponding scouring moment.

[0134] Optionally, the parameter determination module 401 includes:

[0135] A friction velocity determination unit, configured to determine the friction velocity of the riverbed sediment in the river to be measured relative to the water flow interface at different scouring moments according to the river depth, the cylinder Reynolds number, the cylinder radius, the riverbed sediment particle size, and the riverbed sediment density of the river to be measured;

[0136] A parameter determination unit, configured to determine the friction resistance parameter at the corresponding scouring moment according to the friction velocity at different scouring moments;

[0137] Correspondingly, the elevation determination module 405 includes:

[0138] An average velocity determination unit, configured to determine the average velocity of the moving sediment particles at the corresponding scouring moment according to the friction resistance critical value, and the friction velocity and the friction resistance parameter at different scouring moments;

[0139] A bedload transport rate determination unit, configured to determine the bedload transport rate of the river to be measured at a corresponding scouring moment according to the average velocity of moving sediment particles and the proportion of moving sediment particles at different scouring moments;

[0140] An elevation determination unit, configured to determine the riverbed deformation elevation of the river to be measured at a corresponding scouring moment according to the bedload transport rate at different scouring moments.

[0141] The above riverbed deformation elevation determination device can execute the riverbed deformation elevation determination method provided in any embodiment of the present application, and has functional modules and beneficial effects corresponding to executing each riverbed deformation elevation determination method.

[0142] Embodiment 5

[0143] Figure 5 FIG. shows a schematic structural diagram of an electronic device 510 that can be used to implement an embodiment of the present application. The electronic device is intended to represent various forms of digital computers, such as, for example, a laptop computer, a desktop computer, a workbench, a personal digital assistant, a server, a blade server, a mainframe computer, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, for example, a personal digital processor, a cellular phone, a smart phone, a wearable device (such as a helmet, glasses, a watch, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the present application described and / or claimed herein.

[0144] As Figure 5 shown, the electronic device 510 includes at least one processor 511, and a memory communicatively connected to at least one processor 511, such as a read-only memory (ROM) 512, a random access memory (RAM) 513, etc., wherein the memory stores a computer program executable by at least one processor, and the processor 511 can execute various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 512 or the computer program loaded from the storage unit 518 into the random access memory (RAM) 513. In the RAM 513, various programs and data required for the operation of the electronic device 510 can also be stored. The processor 511, the ROM 512, and the RAM 513 are connected to each other through a bus 514. The input / output (I / O) interface 515 is also connected to the bus 514.

[0145] Multiple components in the electronic device 510 are connected to the I / O interface 515, including: an input unit 516, such as a keyboard, a mouse, etc.; an output unit 517, such as various types of displays, speakers, etc.; a storage unit 518, such as a magnetic disk, an optical disc, etc.; and a communication unit 519, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 519 allows the electronic device 510 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0146] The processor 511 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 511 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 511 executes the various methods and processes described above, such as the riverbed deformation elevation determination method.

[0147] In some embodiments, the riverbed deformation elevation determination method can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as the storage unit 518. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device 510 via the ROM 512 and / or the communication unit 519. When the computer program is loaded into the RAM 513 and executed by the processor 511, one or more steps of the riverbed deformation elevation determination method described above can be executed. Alternatively, in other embodiments, the processor 511 can be configured to execute the riverbed deformation elevation determination method by any other suitable means (e.g., by means of firmware).

[0148] The various embodiments of the systems and technologies described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-chip (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special or general-purpose programmable processor, and can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit the data and instructions to the storage system, the at least one input device, and the at least one output device.

[0149] The computer program for implementing the method of the present application can be written in any combination of one or more programming languages. These computer programs can be provided to the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowchart and / or block diagram to be implemented. The computer programs can be executed entirely on the machine, partially on the machine, as a stand-alone software package partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0150] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer-readable storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, the computer-readable storage medium can be a machine-readable signal medium. More specific examples of the machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0151] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and the input received from the user can be in any form (including acoustic input, voice input, or tactile input).

[0152] The systems and techniques described herein can be implemented in a computing system including backend components (e.g., as a data server), or a computing system including middleware components (e.g., an application server), or a computing system including frontend components (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described herein), or a computing system including any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected with each other by digital data communication in any form or medium (e.g., a communication network). Examples of communication networks include: local area network (LAN), wide area network (WAN), blockchain network, and the Internet.

[0153] A computing system can include a client and a server. The client and the server are generally far from each other and typically interact through a communication network. The client-server relationship is created by computer programs running on respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or a cloud host, which is a host product in the cloud computing service system and solves the defects of difficult management and weak business scalability existing in traditional physical hosts and VPS services.

[0154] It should be understood that various forms of the processes shown above can be used, with steps reordered, added, or deleted. For example, the steps recited in this application can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this application can be achieved, and this is not limited herein.

[0155] The above specific embodiments do not constitute a limitation on the protection scope of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims

1. A method for determining the elevation of riverbed deformation, characterized in that, Including: Determine the friction and resistance parameters of the riverbed sediment in the river to be measured relative to the water flow interface at different scouring moments according to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment radius, and riverbed sediment density of the river to be measured; Determine the friction and resistance critical value according to the angle of repose of the sediment in the river to be measured and the water flow direction at the riverbed; Respectively determine the scouring mode corresponding to each of the friction and resistance parameters according to the relative magnitudes of each of the friction and resistance parameters and the friction and resistance critical value; Determine the proportion of moving sediment particles corresponding to each of the friction and resistance parameters at different scouring moments by using the proportion determination method corresponding to the corresponding scouring mode; Determine the riverbed deformation elevation of the river to be measured at the corresponding scouring moment according to the proportion of moving sediment particles at different scouring moments.

2. The method according to claim 1, characterized in that, The scouring mode is a clear water scouring mode or a movable bed scouring mode; among them, the proportion determination methods corresponding to different scouring modes are different.

3. The method according to claim 2, characterized in that, The step of respectively determining the scouring mode corresponding to each of the friction and resistance parameters according to the relative magnitudes of each of the friction and resistance parameters and the friction and resistance critical value includes: If the friction and resistance parameter is greater than the friction and resistance critical value, the scouring mode is a movable bed scouring mode; If the friction and resistance parameter is not greater than the friction and resistance critical value, the scouring mode is a clear water scouring mode.

4. The method according to claim 2, characterized in that, If the scouring mode corresponding to the corresponding scouring moment is a clear water scouring mode, the step of determining the proportion of moving sediment particles corresponding to each of the friction and resistance parameters at different scouring moments by using the proportion determination method corresponding to the corresponding scouring mode includes: Set the proportion of moving sediment particles at the corresponding scouring moment to a preset proportion threshold.

5. The method according to claim 4, characterized in that, The preset proportion threshold is 0.

6. The method according to claim 2, characterized in that, If the scouring mode corresponding to the corresponding scouring moment is a movable bed scouring mode, the step of determining the proportion of moving sediment particles corresponding to each of the friction and resistance parameters at different scouring moments by using the proportion determination method corresponding to the corresponding scouring mode includes: Determine the proportion of moving sediment particles at the corresponding scouring moment according to the friction and resistance parameter at the corresponding scouring moment, the friction and resistance critical value, and the dynamic friction coefficient of the river to be measured at a preset angle of repose of the sediment.

7. The method according to any one of claims 1-6, characterized in that, The step of determining the friction and resistance parameters of the riverbed sediment in the river to be measured relative to the water flow interface at different scouring moments according to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment particle size, and riverbed sediment density of the river to be measured includes: Determine the friction velocity of the riverbed sediment in the river to be measured relative to the water flow interface at different scouring moments according to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment radius, and riverbed sediment density of the river to be measured; Determine the friction and resistance parameter at the corresponding scouring moment according to the friction velocity at different scouring moments; Correspondingly, the step of determining the riverbed deformation elevation of the river to be measured at the corresponding scouring moment according to the proportion of moving sediment particles at different scouring moments includes: Determine the average velocity of moving sediment particles at the corresponding scouring moment according to the friction and resistance critical value, and the friction velocity and friction and resistance parameter at different scouring moments. Determine the bed load transport rate of the river to be measured at the corresponding scour time according to the average velocity of moving sediment particles and the proportion of moving sediment particles at different scour times. Determine the riverbed deformation elevation of the river to be measured at the corresponding scour time according to the bed load transport rate at different scour times.

8. A device for determining the elevation of riverbed deformation, characterized in that, It includes: A parameter determination module, configured to determine the friction resistance parameters of the riverbed sediment in the river to be measured at different scour times relative to the water flow interface according to the river depth, cylinder Reynolds number, cylinder radius, riverbed sediment radius, and riverbed sediment density of the river to be measured. A critical value determination module, configured to determine the friction resistance critical value according to the angle of repose of the sediment in the river to be measured and the water flow direction at the riverbed. A scour mode determination module, configured to determine the scour mode corresponding to each of the friction resistance parameters respectively according to the relative magnitudes of the friction resistance parameters and the friction resistance critical value. A proportion determination module, configured to determine the proportion of moving sediment particles corresponding to each of the friction resistance parameters at different scour times by using the proportion determination method corresponding to the corresponding scour mode. An elevation determination module, configured to determine the riverbed deformation elevation of the river to be measured at the corresponding scour time according to the proportion of moving sediment particles at different scour times.

9. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the riverbed deformation elevation determination method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions, and the computer instructions are used to implement the riverbed deformation elevation determination method according to any one of claims 1-7 when executed by a processor.

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